ferrous oxide

American  

noun

Chemistry.

1. a black powder, FeO, insoluble in water, soluble in acid.

---

ferrous oxide Scientific  

1. A black powder used to make steel, green heat-absorbing glass, and enamels. Chemical formula: FeO.

---

Etymology

Origin of ferrous oxide

First recorded in 1870–75

Example Sentences

Amused and enchanted, I named him "Ferrous" for the chemical name of rust, hydrated ferrous oxide.

From New York Times • Feb. 13, 2018

The analysis showed the presence of 6.89 per cent. of ferrous oxide, and some oxide of copper.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

"The results of this chemical investigation show that the chief advantages of this system of putrefaction are: "First.—The active agent, hydrated ferrous oxide, is prepared within the sewage itself as a flocculent precipitate.

From Scientific American Supplement, No. 799, April 25, 1891 by Various

Ferrous Oxide.—When a qualitative test shows both ferric and ferrous oxide to be present, the proportion of the ferrous oxide must be separately determined.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

For example, ferrous oxide is FeO and ferrous chloride is FeCl2, and, again, ferric oxide is Fe2O3, whilst ferric chloride is Fe2Cl6.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius